Correct sizing prevents sagging, overheating, and premature failure. You don’t need a PhD—just a consistent method. This step‑by‑step approach helps you determine width, depth, support spacing, and allowable load with confidence.

Step 1: Define Cable Inventory

List cable types, diameters, and weights per metre. Group by power, control, and data. Plan 20–30% spare capacity for growth. Remember separation rules for EMI and for fibre bend radius.

Step 2: Choose Tray Type and Width

For heavy power cables or long spans, ladder trays typically perform best. For mixed small cables, perforated works well. Width is set by total cable area plus spare factor; depth helps maintain side containment and segregation.

Step 3: Support Spacing and Load

Use manufacturer load tables. Pick a span (often 1.5–3 m) and verify the uniform load rating exceeds your cable weight plus a safety factor. Check deflection limits to protect terminations and fibre.

Step 4: Accessories and Transitions

Specify horizontal/vertical bends, tees, reducers, drop‑outs, and barriers. Choose radii that respect cable bend limits. Where cables exit, use drop‑outs to avoid sharp edges.

Step 5: Documentation

Produce drawings with elevations, supports, and IDs. Label routes. Provide an installation method statement so technicians maintain clearances and torque values.

Ned‑Tech can translate your cable schedule into a bill of materials, ensuring you order exactly what you need—no more, no less.

Need a bill of materials or sizing help? Contact Ned‑Tech Cable Tray Ltd for design assistance and fast delivery.